My T told me his supervisor doesn't know who any of his clients are apart from
their first names as these would probably slip out sooner or later.

I'm a bit hmm about videoing a session at a group that doesn't usually have a camera because the presence of the camera is bound to change things (observer paradox).

Anyway, this would unsettle me too. I'm fine with knowing my T has someone overseeing his work (a must as he's in the UK and registered with UKCP) but I wouldn't want to know what they said about me.